知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

147 条记录 (耗时 0.013 秒)

    Method for the production of nitric acid
    1.
    发明申请
    Method for the production of nitric acid 有权
    硝酸生产方法

    公开(公告)号：US20050106092A1

    公开(公告)日：2005-05-19

    申请号：US10505242

    申请日：2003-02-15

    申请人： Frank Dziobek ,  Detlev Claes ,  Joachim Johanning ,  Rainer Maurer ,  Erich Szonn

    发明人： Frank Dziobek ,  Detlev Claes ,  Joachim Johanning ,  Rainer Maurer ,  Erich Szonn

    IPC分类号： C01B21/40 ,  C01B21/38 ,  C01B21/44 ,  C01B21/46 ,  H02P9/04

    CPC分类号： C01B21/26 ,  C01B21/28 ,  F01K23/064 ,  Y02P20/129

    摘要： The invention relates to a method for the production of nitric acid having a concentration of between 50 and 76%, from ammonia and gas containing oxygen, under pressure, according to a single pressure method or dual pressure method. The expansion of the residual gas takes place in at least two stages in a work efficient manner. At least one device for heating the previously expanded gas to a temperature of more than 450° is disposed between every other expansion stage, using waste heat from the production process of nitric acid.

    摘要翻译： 本发明涉及一种根据单一压力法或双压法在压力下从氨和含氧气体生产浓度为50至76％的硝酸的方法。 残余气体的膨胀以至少两个阶段以有效的方式进行。 使用来自硝酸生产过程的废热，将至少一个用于将先前膨胀的气体加热到大于450°的温度的装置设置在每个其它膨胀阶段之间。

    Method for the production of highly pure nitric acid
    2.
    发明申请
    Method for the production of highly pure nitric acid 审中-公开
    生产高纯硝酸的方法

    公开(公告)号：US20050074389A1

    公开(公告)日：2005-04-07

    申请号：US10473212

    申请日：2002-03-27

    申请人： Paul Hofmann ,  Franz Sanden ,  Walter Dorflinger

    发明人： Paul Hofmann ,  Franz Sanden ,  Walter Dorflinger

    IPC分类号： C01B21/46 ,  C01B21/44

    CPC分类号： C01B21/46

    摘要： In a new and improved process for preparing high-purity nitric acid by distillation or rectification of nitric acid, crude nitric acid or mixtures thereof in a column, 85-95% strength by weight nitric acid, crude nitric acid or a mixture thereof is distilled at from 70 to 110° C. and a pressure of from 0.1 to 2 bar.

    摘要翻译： 在一个新的和改进的方法中，通过蒸馏或精馏硝酸，粗硝酸或其混合物在塔中制备高纯度硝酸，蒸馏85-95％重量浓度的硝酸，粗硝酸或其混合物 70至110℃，压力为0.1至2巴。

    Point-of-use recycling of wafer cleaning substances
    3.
    发明授权
    Point-of-use recycling of wafer cleaning substances 失效
    晶圆清洗物质的使用点回收利用

    公开(公告)号：US5632866A

    公开(公告)日：1997-05-27

    申请号：US180546

    申请日：1994-01-12

    申请人： Donald C. Grant

    发明人： Donald C. Grant

    IPC分类号： B01D3/36 ,  B01D3/34 ,  C01B7/01 ,  C01B7/07 ,  C01B7/09 ,  C01B7/19 ,  C01B9/04 ,  C01B21/46 ,  H01L21/304 ,  C01B17/90

    CPC分类号： C01B7/0712 ,  B01D3/343 ,  C01B21/46 ,  C01B7/093 ,  C01B7/196 ,  Y10S159/19

    摘要： A method of recycling and purifying cleaning chemicals used in the production of semiconductor circuits and containing hydrofluoric acid and or hydrochloric acid. Recycling of such chemicals is accomplished using separation and reconstitution steps Hydrofluoric acid and hydrochloric acid cannot be distilled directly from a chemical solution as they form azeotropes with water. A low vapor pressure substance such as sulfuric acid or phosphoric acid is used to break the azeotrope while increasing the purity of the recovered chemicals and decreasing disposal problems. The method is useable at the point of use of the chemicals.

    摘要翻译： 一种用于生产半导体电路并含有氢氟酸和/或盐酸的清洁化学品的再循环和净化方法。 这种化学品的回收利用分离和重构步骤完成。当氢氟酸和盐酸与水形成共沸物时，不能直接从化学溶液中蒸馏出氢氟酸和盐酸。 使用低蒸汽压物质如硫酸或磷酸来破坏共沸物，同时提高回收的化学品的纯度并减少处理问题。 该方法可用于化学品的使用。

    Separation of acids
    6.
    发明授权
    Separation of acids 失效
    分离酸

    公开(公告)号：US4285924A

    公开(公告)日：1981-08-25

    申请号：US136954

    申请日：1980-04-03

    申请人： Michael W. T. Pratt

    发明人： Michael W. T. Pratt

    IPC分类号： C01B7/07 ,  C01B21/46 ,  C01B25/18

    CPC分类号： C01B21/46 ,  C01B25/18 ,  C01B7/0731

    摘要： A method for the separation of nitric acid from a mixture of nitric acid with one or more of phosphoric, sulphuric or hydrochloric acids, in which the nitric acid is selectively extracted from a first phase comprising the acid mixture into a second phase by an amine nitrate. The method may conveniently be carried into effect by treating an aqueous mixture of acids with kerosene containing tri-n-octylamine nitrate and a modifyier e.g. decanol following which the excess nitric acid is stripped from the kerosene phase by water or dilute nitric acid.

    摘要翻译： 一种从硝酸与一种或多种磷酸，硫酸或盐酸的混合物中分离硝酸的方法，其中将硝酸从包含酸混合物的第一相中选择性地提取为第二相，其中硝酸硝酸盐 。 该方法可以方便地通过用含有三正辛胺硝酸盐的煤油和一种改性剂的酸处理含水混合物来实施。 癸醇，然后用水或稀硝酸从煤油相中除去过量的硝酸。

    Removing nitrates with an organic amine salt and ion exchange
    7.
    发明授权
    Removing nitrates with an organic amine salt and ion exchange 失效
    用有机胺盐除去硝酸盐并进行离子交换

    公开(公告)号：US3983222A

    公开(公告)日：1976-09-28

    申请号：US524926

    申请日：1974-11-18

    申请人： Timo Kalevi Lehto

    发明人： Timo Kalevi Lehto

    IPC分类号： C01B21/48 ,  B01D11/04 ,  C01B21/46 ,  C22B3/28 ,  C01D9/16

    CPC分类号： C01B21/46 ,  B01D11/0488 ,  C22B3/0013 ,  Y02P10/234

    摘要： A continuous process for removing nitrates from nitrate containing aqueous solutions having a pH of about 0-7, which comprises: (1) extracting the nitrate containing aqueous solution with an organic amine salt dissolved in an organic solvent phase whereby the nitrate ion goes into the organic solvent, (2) separating the organic phase, (3) stripping the organic extraction solvent phase from the extraction with a stripping salt solution of pH at least 0.5, said salt being capable of ion exchange with the nitrate ion and containing the anion of the amine salt in step (1) to strip and convert the amine for the next extraction cycle into the same amine salt as used for the extraction; and the stripping solution contains the nitrate ion and the cation of the stripping solution; (4) maintaining the concentration of the salt formed by the cation of the stripping salt and the nitrate anion in the stripping solution so high that this salt is crystallized from the stripping solution substantially continuously, but still so low that the nitrate anion extracted into the organic extraction solvent phase passes during the stripping continuously into the stripping solution while the anion of the stripping salt passes from the stripping solution into the organic extraction solvent phase; and recovering crystallized nitrate salt from the stripping solution.

    摘要翻译： 一种从含硝酸盐的水溶液中除去硝酸盐的连续方法，其pH为约0-7，其包括：（1）用溶于有机溶剂相中的有机胺盐萃取含硝酸盐的水溶液，由此硝酸根离子进入 有机溶剂，（2）分离有机相，（3）用pH至少为0.5的汽提盐溶液萃取萃取有机萃取相，所述盐能够与硝酸根离子交换并含有阴离子 步骤（1）中的胺盐，将用于下一个萃取循环的胺分离并转化成与用于萃取的胺盐相同的胺盐; 汽提溶液中含有硝酸根离子和汽提溶液的阳离子; （4）保持汽提溶液中的阳离子和硝酸根阴离子形成的盐的浓度如此高，使得该盐基本上连续地从汽提溶液中结晶，但仍然如此之低，以致硝酸根阴离子被萃取到 有机萃取溶剂相在汽提过程中连续进入汽提溶液，而汽提盐的阴离子从汽提溶液中通过有机萃取溶剂相; 并从剥离溶液中回收结晶的硝酸盐。

    Nitric acid recovery system
    9.
    发明授权
    Nitric acid recovery system 失效
    硝酸回收系统

    公开(公告)号：US3852412A

    公开(公告)日：1974-12-03

    申请号：US40832473

    申请日：1973-10-23

    申请人： BRUNSWICK CORP

    发明人： BRENNER W

    IPC分类号： C01G49/00 ,  C01B21/42 ,  C01B21/46 ,  C01G49/06

    CPC分类号： C01B21/42 ,  C01G49/06 ,  Y10S423/01

    摘要： A method for recovering nitric acid solutions and ferric oxide from acidic solutions of ferric nitrate, including the steps of adjusting the nitric acid concentration to the nitric acid-water azeotrope and distilling the solution under such azeotropic conditions.

    摘要翻译： 一种从硝酸铁的酸性溶液中回收硝酸溶液和氧化铁的方法，包括在硝酸 - 水共沸物中调节硝酸浓度，并在这种共沸条件下蒸馏溶液的步骤。